This is the start of the stream connection iterator which calls the
data-layer reader. This still looks a bit tricky but is OK. Splicing
is not handled at all at the moment.
The "raw_sock" prefix will be more convenient for naming functions as
it will be prefixed with the data layer and suffixed with the data
direction. So let's rename the files now to avoid any further confusion.
The #include directive was also removed from a number of files which do
not need it anymore.
